public class test2_5 {
   public static void main(String args[]) {
      long [] a = {1,2,3,4};
      long [] b = {100,200,300,400,500};
      b = a;
      System.out.println("数组b的长度"+b.length);
      System.out.println("b[0]="+b[0]);
   }
}

